<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>01_js的三种引入方式</title>
</head>
<body>
<button onclick="alert('请先登录')">点击即玩</button>
<button onclick="console.log(666)">点击即玩</button>

<h1 id="h1">我是大标题</h1>
<script>
    console.log(h1);
</script>

<script src="01.js">
    // console.log('zhixing ')
</script>
</body>
</html>